Sunan An-Nasa'i - سنن النسائي
51. The Book of Drinks - كتاب الأشربة
13) Chapter: Mentioning the Reason Why These Mixtures are Forbidden, Which is That One of Them is Mor
It was narrated that :
Anas would not leave any dates that had become ripe but he would remove them from his Fadikh.
13) باب ذِكْرِ الْعِلَّةِ الَّتِي مِنْ أَجْلِهَا نَهَى عَنِ الْخَلِيطَيْنِ وَهِيَ لِيَقْوَى أَحَدُهُمَا عَلَى صَاحِبِهِ
أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ حُمَيْدٍ، عَنْ أَنَسٍ، أَنَّهُ كَانَ لاَ يَدَعُ شَيْئًا قَدْ أَرْطَبَ إِلاَّ عَزَلَهُ عَنْ فَضِيخِهِ .